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She can be taught to like and dislike certain things and can even orgasm.

There is also a male variety called Rocky who sells for $9995 (£6,900).

But while its articulated skeleton means the dolls can be positioned by hand, they cannot move their limbs independently.

Engineer Douglas Hines is behind on the world's pioneering sex robot Roxxxy but says half of orders they receives are for celebrity lookalikes

When Mr Hines first presented the bot at the 2010 AVN Adult Entertainment Expo in Las Vegas, he was ridiculed because the bot looked clunky, manly, had a square jaw and her lips didn't move when she spoke.

She had sensors on her hands that, when touched, she would say 'I love holding hands with you' when she was in 'Frigid Farrah' mode.

But when in 'Wild Wendy,' mode she would say 'I know a place you could put that hand.'

Roxxxy has many customisation options which include changing the way she acts around you and what her hair and skin look like. She stands at 5 feet 7 inches tall (170 cm) and weighs 120 pounds (8.5 stone)

From AI personalities capable of holding a conversation to models with a functioning G-spot, firms are hoping consumers will pay up to $15,000 (£11,600) for a sex doll that never says no.

Among the most impressive is RealDoll's Harmony - an artificial intelligence based sex bot that can hold conversations, remember what she's told and even has a customizable personality.

Arguably one of the most life-like dolls being developed, Harmony is fully customizable - from her hair down to her labia.

The figures are even fitted with a hinged jaw, with 'soft, stretchy lips, ultra soft tongue, soft silicone teeth.'

THE SEX DOLL CONTENDERS

Harmony's AI system will allow users to choose different personality trait settings for the sex assistant, such as kind, sexual, shy, naive and brainy and choose how strongly these traits are expressed in their doll

Harmony - an artificial intelligence based sex bot that can hold conversations, remember what she's told and has a customizable personality.

The bizarre doll talks in a Scottish accent, and can be programmed with 18 different personality traits, including 'shy' and 'sexual.'

The doll also comes with a 'persistent memory' allowing her to build up relationships with her owners.

The life-like silicon doll is created with a flexible skeleton and requires about 80 hours of work from start to finish, and even has customised genitalia and interchangeable faces.

Standard dolls come with the choice of 18 female body types, or two male figures.

This 2010 image of Roxxxy shows the only publicly demonstrated version

Roxxxy - Her creator Douglas Hines is working on his 16th version of Roxxxy, but no photos of the new version have been released since 2010.

Then, she was presented at a convention and looked clunky, manly, and her lips didn't move when she spoke.

Eva is based on moulds taken from real women's bodies

Eva - Built based on moulds of real women's bodies.

'Our ultra realistic Android Love Dolls are hand made to perfection to create the most perfect human like silicone sex dolls ever,' the firm behind it says.

'To make a human like silicone sex doll first we do a full body silicone lifecast on the model in order to make a perfect replica and ultrarealistic android love doll. '

The robot's maker boasts that she could put herself in 20 different sex positions, and has a fully functional AI who 'won't complain and is ready 24/7.'

Samantha boasts a functional vagina and mouth

Samantha - She is covered in sensors that respond to human touch and can switch between 'family' and 'sexy' mode.

She has a functional G-spot.

The sex robot also has a functional vagina and mouth, according to its Spanish inventor.

The robot speaks in an American accent and says sexual phrases such as 'I'm on for you all the time', 'nice and gentle' and 'now then, what's next?'